net/mrvl: check if ppio is initialized
net/mrvl: check if ppio is initialized

Uninitialized ppio cannot be passed to MUSDK library routines as
application will crash.

Fix this by first checking whether ppio has been initialized.

Signed-off-by: Tomasz Duszynski <389c907effde06d7d3e3fb2cf2ccfaf9dc5af62a@semihalf.com>
Acked-by: Jianbo Liu <ad48e27d4475ec2c10ba93ba465af79f05639344@arm.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk